The mechanical vibration source classifier is a modern library for classifying events around an optical fiber, which is programmed in Python. This library provides the ability to classify events using sophisticated signal processing and machine learning methods. The library also contains a simple API (so-called “application programming interface”). It allows you to easily update the functionality and settings of the parameterization, but also the classification itself based on the configuration file. The package also provides the ability to easily add / remove events for classification, making it flexible and easily extensible.